I assume only one thread is needed.The other one is removed.If there would be any necessity, I can move it back.

Difficult to judge.Did write into your file system or override it?At the moment, it's not recommended to write anything to your disk/partition anymore.Especially if you have had photos, PhotoRec would be a good idea.Tip for using PhotoRec, go to File Opt and press s to deselect all file types.Activate only required file types like jpg. etc..Scan Free space.So PhotoRec will recover photos only from unallocated or free space.Also some infos here;http://www.cgsecurity.org/wiki/PhotoRec_Step_By_Step

I'm not sure what you mean by write into or override, sorry. I installed Linux over a Windows partition, so I guess it was re-partitioned and formatted.

I scanned the entire HDD with photorec and it found over 10,000 files, loads of rubbish in there but I managed to find what I think is enough pictures to be content with, not sure if I found them all as I have spent all day sifting through 10,000 files..lol but I thank you for your help.

Photoec wasnt able to recover any files from my MMC though. Some people suggested I scan the MMC 1st as that would be the easiest way but it turned out scanning the HDD was the better option.